Super unfortunate situation with a lot of key pieces throughout. Though, if the don had went schizophrenic and thought you had plans on killing/couping him, even if you weren’t, he is within his rights to remove you by killing you.
For the other reason listed, even if the don was mistaken and believed you had partaken in hits even if you didn’t he is allowed to kill you. If he has made a mistake it’s on him at the end of the day.
There is no evidence to show this PK was done out of bad faith, which could have changed things for this appeal. More likely it was done from poor management somewhere along the way on either side.